SITE INFORMATION AND CORRESPONDENCE_FILE 1

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M Ms. Linda Turkette San Joaquin County Public Health Services, Environmental Health Division Page 2 February 2, 1995 Your letter asked that the feasibility study for various remedial options be completed concurrently with the assessment phase. We are concerned that any feasibility work not be based on incomplete assessment data. We have begun to perform initial feasibility evaluations including the procurement and evaluation of three similar site files in the Stockton area, which were discussed during our meeting of November 4 , 1994 . However, a meaningful feasibility study cannot be concluded until the extent of contamination is reasonably well constrained. Therefore, we would propose to provide an update on our preliminary feasibility work as part of the reporting of the next phase of investigation, but would defer any final conclusions on remedial feasibility until the complete extent of contamination is defined. The final point addressed in your letter was concerned with implementing the soil and purge water disposal plan which has already been submitted. While we are prepared to begin with that program, we would prefer to wait until substantially all of the investigation-related wastes have been generated. We anticipate that will be at the conclusion of the next phase of work, although there could be some minor additional drilling in the future that would generate residuals. Therefore, we would propose to implement the disposal plan at the conclusion of the next phase of investigation unless there will be significant additional volumes of waste generated. We are prepared to proceed with the work plan as outlined in our January 4 , 1995 letter. If you have any questions or comments, please contact me at (916) 253-2155. Respectfully submitted, MI CRE�ASS CIA /Tsell W. Juncal ��// CA Reg. Geol. 3864 RWJ:kac Enclosures